Put bets are definitely not offered in every casino that has Craps. The reason may be because the casino may not offer enough odds to be taken on Put bets in order to make them mathematically better than Place bets. Or, the casino may simply just not choose to allow them.
But the reason you may not have heard of them at your casino is probably because they are somewhat unpopular to begin with. My experience tells me that the reason for this is more because people don't know about the bet, rather than they don't like the bet. And of course, when players do know about them... the casino would have to offer favorable conditions and you would have to be betting with amounts to take advantage of those conditions in order for them to pay better than their corresponding Place or Buy bets.
However, even if you can take advantage of a Put bet's better payout, you sacrifice the ability to turn the bet "off" or take the entire bet down before it is resolved. Many players value this flexibility that Place/Buy bets offer and is likely another reason that contributes to the unpopularity of Put bets.
